[3.0] 0358917 Add short example on how to get Websockets to work (#2)

[Tollef Fog Heen]

commit 0358917a6edaea5a4798a83e0a3dc0f6ca5b5ab8
Author: Lasse Karstensen <lasse at varnish-software.com>
Date:   Fri Feb 24 15:14:12 2012 +0100

    Add short example on how to get Websockets to work (#2)

diff --git a/doc/sphinx/tutorial/index.rst b/doc/sphinx/tutorial/index.rst
index c3a05f5..6769ec4 100644
--- a/doc/sphinx/tutorial/index.rst
+++ b/doc/sphinx/tutorial/index.rst
@@ -29,6 +29,7 @@ separate topic. Good luck.
 	compression
 	esi
 	virtualised
+	websockets
 	advanced_backend_servers
         handling_misbehaving_servers
         advanced_topics